TWI482324B - Touch panel and displaying device using the same - Google Patents

Description

Touch screen and display device

The present invention relates to a touch screen and a display device using the same, and more particularly to a carbon nanotube-based touch screen and a display device using the same.

In recent years, with the development of high performance and diversification of various electronic devices such as mobile phones and touch navigation systems, electronic devices in which a translucent touch panel is mounted on the front surface of a display element such as a liquid crystal are gradually increasing. The user of such an electronic device operates by pressing the touch panel with a finger or a pen while visually checking the display content of the display element located on the back surface of the touch panel through the touch panel. Thereby, various functions of the electronic device can be operated.

According to the working principle of the touch screen and the transmission medium, the previous touch screens are generally divided into four types, namely resistive, capacitive sensing, infrared and surface acoustic wave. Among them, the resistive touch screen is the most widely used (K. Noda, K. Tanimura, Electronics and Communications in Japan, Part 2, Vol. 84, No. 7, P40 (2001)).

The conventional resistive touch screen generally includes an upper substrate, the upper surface of which is formed with an upper transparent conductive layer and two upper electrodes are disposed at two ends of the upper transparent conductive layer along the X direction; the lower substrate, the upper surface of the lower substrate is formed a transparent conductive layer and two lower electrodes are disposed at two ends of the lower transparent conductive layer along the Y direction; and a plurality of dot spacers are disposed between the upper transparent conductive layer and the lower transparent conductive layer, wherein the above X direction and Y side Toward vertical. The upper electrode and the lower electrode are usually made of a conductive silver paste layer. The above touch screen is usually covered on a display. When the upper substrate is pressed with a finger or a pen, the upper substrate is twisted so that the upper transparent conductive layer and the lower transparent conductive layer at the pressing place are in contact with each other. The voltage is sequentially applied to the upper transparent conductive layer and the lower transparent conductive layer through the external electronic circuit, and the touch screen controller measures the voltage change on the first conductive layer and the voltage change on the second conductive layer through the upper electrode and the lower electrode, respectively, and performs Calculate it accurately and convert it to contact coordinates. The touch screen controller passes the digitized contact coordinates to the central processor. The central processor issues corresponding commands according to the coordinates of the contacts, initiates various function switching of the electronic device, and controls display of the display components through the display controller.

However, the silver glue layer has the disadvantages of poor mechanical and chemical durability, and the substrate on the touch screen is usually a flexible substrate. Therefore, when the silver glue layer is formed on the flexible substrate as the upper electrode, the silver glue layer is used multiple times. After the bending of the substrate is easy to fall off and damage, the previous resistive touch screen and the display device have poor durability and short life. In addition, the use of a silver paste layer as the electrode is costly, so that the touch screen using the electrode is costly.

In view of this, it is necessary to provide a touch screen and a display device which are excellent in durability, high in sensitivity, linear and accurate, and high in brightness.

A touch screen includes a first electrode plate, the first electrode plate includes a first substrate, a first conductive layer is disposed on a lower surface of the first substrate, and two first electrodes are disposed in the first direction in the first direction Two ends of the conductive layer; a second electrode plate, the second electrode plate is spaced apart from the first electrode plate, The second electrode plate includes a second substrate, a second conductive layer is disposed on the upper surface of the second substrate, and two second electrodes are disposed on the two ends of the second conductive layer in the second direction; wherein: the first electrode At least one of the electrodes and the second electrode comprises a carbon nanotube layer.

A display device includes a touch screen, the touch screen includes a first electrode plate and a second electrode plate, the first electrode plate includes a first substrate, a first conductive layer is disposed on a lower surface of the first substrate, and The two first electrodes are disposed at two ends of the first conductive layer along the first direction, the second electrode plate is spaced apart from the first electrode plate, the second electrode plate includes a second substrate, and a second conductive layer is disposed thereon The upper surface of the second substrate, and the two second electrodes are disposed at two ends of the second conductive layer along the second direction; wherein: at least one of the first electrode and the second electrode comprises a carbon nanotube layer.

Compared with the prior art, the touch screen and the display device provided by the technical solution have the following advantages: First, the excellent mechanical properties of the carbon nanotubes make the carbon nanotube film have good toughness and mechanical strength, so The carbon nanotube film replaces the previous silver layer as the electrode, which can improve the durability of the touch screen and improve the durability of the display device. Second, the process of preparing the carbon nanotube film by direct stretching The utility model has the advantages of simple and low cost, and can directly adhere to the substrate or the conductive layer by using the directly stretched carbon nanotube film, thereby facilitating mass production of a touch screen and a display device using a carbon nanotube film structure as an electrode.

The touch screen and the display device provided by the embodiments of the present technical solution will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , the embodiment of the present disclosure provides a touch screen 10 , which includes a first electrode plate 12 , a second electrode plate 14 , and a first electrode plate 12 and a second electrode plate 14 . A plurality of transparent dot spacers 16 therebetween.

The first electrode plate 12 includes a first substrate 120, a first conductive layer 122 and two first electrodes 124. The first substrate 120 is a planar structure, and the first conductive layer 122 and the two first electrodes 124 are disposed on the lower surface of the first substrate 120. The two first electrodes 124 are respectively disposed at both ends of the first conductive layer 122 in the first direction and are electrically connected to the first conductive layer 122. The second electrode plate 14 includes a second substrate 140, a second conductive layer 142 and two second electrodes 144. The second substrate 140 is a planar structure, and the second conductive layer 142 and the two second electrodes 144 are both disposed on the upper surface of the second substrate 140. The two second electrodes 144 are respectively disposed at two ends of the second conductive layer 142 in the second direction and are electrically connected to the second conductive layer 142. The first direction is perpendicular to the second direction, that is, the two first electrodes 124 are orthogonal to the two second electrodes 144. The first substrate 120 is a transparent film and a film having a certain degree of softness. The second substrate 140 is a transparent substrate. The material of the second substrate 140 may be glass, quartz, diamond, plastic or the like. The second substrate 140 serves mainly as a support. The first conductive layer 122 and the second conductive layer 142 are conductive indium tin oxide (ITO) layers, carbon nanotube layers, conductive polymer layers, or other transparent conductive materials. In this embodiment, the first substrate 120 is a polyester film, the second substrate 140 is a glass substrate, and the first conductive layer 122 and the second conductive layer 142 are conductive indium tin oxide (ITO) layers.

Further, an insulating layer is disposed on the outer surface of the upper surface of the second electrode plate 14. 18. The first electrode plate 12 is disposed on the insulating layer 18, and the first conductive layer 122 of the first electrode plate 12 is disposed opposite to the second conductive layer 142 of the second electrode plate 14. The plurality of dot spacers 16 are disposed on the second conductive layer 142 of the second electrode plate 14, and the plurality of dot spacers 16 are spaced apart from each other. The distance between the first electrode plate 12 and the second electrode plate 14 is 2 to 10 μm. Both the insulating layer 18 and the dot spacer 16 may be made of an insulating resin or other insulating material, and the dot spacer 16 should be formed of a transparent material. Providing the insulating layer 18 and the dot spacers 16 may electrically insulate the first electrode plate 14 from the second electrode plate 12. It can be understood that when the touch screen 10 is small in size, the dot spacer 16 is an optional structure, and it is only necessary to ensure that the first electrode plate 14 is electrically insulated from the second electrode plate 12.

In addition, a transparent protective film 126 may be disposed on the upper surface of the first electrode plate 12. The transparent protective film 126 may be directly bonded to the transparent conductive layer 24 by an adhesive, or may be pressed together with the first electrode plate by a hot pressing method. The transparent protective film 126 may be a surface hardened, smooth scratch-resistant plastic layer or a resin layer formed of a material such as phenylcyclobutene (BCB), polyester, or acrylic resin. In this embodiment, the material for forming the transparent protective film 126 is polyethylene terephthalate (PET) for protecting the first electrode plate 12, thereby improving durability. The transparent protective film 126 can be used to provide some additional functions such as reducing glare or reducing reflection.

At least one of the first electrode 124 and the second electrode 144 includes a carbon nanotube layer including a plurality of carbon nanotubes. Specifically, the carbon nanotube layer may further include a plurality of carbon nanotube film overlapping arrangements. The carbon nanotube film in the above carbon nanotube layer is composed of ordered or disordered carbon nanotubes, and the carbon nanotube film has uniformity thickness. Specifically, the carbon nanotube layer comprises a disordered carbon nanotube film or an ordered carbon nanotube film. In the disordered carbon nanotube film, the carbon nanotubes are disordered or isotropic. The disordered array of carbon nanotubes are intertwined, and the isotropically aligned carbon nanotubes are parallel to the surface of the carbon nanotube film. In the ordered carbon nanotube film, the carbon nanotubes are arranged in a preferred orientation along the same direction or in a preferred orientation in different directions. When the carbon nanotube layer comprises a multi-layered ordered carbon nanotube film, the multi-layered carbon nanotube film can be arranged in any direction, so that in the carbon nanotube layer, the carbon nanotubes are along the same or Different orientations are preferred.

The carbon nanotube film may have a width of 1 micrometer to 10 centimeters and a thickness of 0.5 nanometer to 10 micrometers. The carbon nanotubes include single-walled carbon nanotubes, double-walled carbon nanotubes or multi-walled carbon nanotubes. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5 nm to 50 nm. Nano.

In this embodiment, the first electrode 124 and the second electrode 144 are stacked multi-layered ordered carbon nanotube films, and the overlapping angle of the multilayer carbon nanotube film is not limited. The carbon nanotubes in each layer of carbon nanotube film are ordered. Further, each of the carbon nanotube films comprises a plurality of preferentially aligned carbon nanotube bundles having substantially equal lengths. They are arranged end to end in a continuous carbon nanotube film. Preferably, the first electrode 124 and the second electrode 144 are both carbon nanotube film structures that are stacked in different directions by a plurality of layers of carbon nanotube film.

The preparation method of the carbon nanotube film in the first electrode 124 and/or the second electrode 144 of the embodiment mainly includes the following steps:

Step 1: Providing an array of carbon nanotubes, preferably the array is a super-sequential carbon nanotube array.

The carbon nanotube array provided by the embodiment of the technical solution is a single-walled carbon nanotube array, a double-walled carbon nanotube array, or a multi-walled carbon nanotube array. In this embodiment, the method for preparing the super-sequential carbon nanotube array adopts a chemical vapor deposition method, and the specific steps include: (a) providing a flat substrate, the substrate may be selected from a P-type or N-type germanium substrate, or selected The tantalum substrate is formed with an oxide layer. In this embodiment, a 4-inch tantalum substrate is preferably used; (b) a catalyst layer is uniformly formed on the surface of the substrate, and the catalyst layer material may be iron (Fe), cobalt (Co) or nickel ( (1) annealing the substrate on which the catalyst layer is formed in air at 700 to 900 ° C for about 30 minutes to 90 minutes; (d) placing the treated substrate in a reaction furnace In the protective gas atmosphere, the temperature is heated to 500-740 ° C, and then the carbon source gas is introduced for about 5 to 30 minutes to grow, and the ultra-sequential carbon nanotube array is grown to have a height of 200 to 400 μm. The super-sequential carbon nanotube array is a plurality of pure carbon nanotube arrays formed of carbon nanotubes that are parallel to each other and perpendicular to the substrate. The super-sequential carbon nanotube array contains substantially no impurities such as amorphous carbon or residual catalyst metal particles, etc., by controlling the growth conditions described above. The carbon nanotubes in the array of carbon nanotubes are in close contact with each other to form an array by van der Waals force. The carbon nanotube array is substantially the same area as the above substrate.

In this embodiment, the carbon source gas may be a chemically active hydrocarbon such as acetylene, ethylene or methane. The preferred carbon source gas in this embodiment is acetylene; the shielding gas is nitrogen or an inert gas, and the preferred shielding gas in this embodiment. It is argon.

It can be understood that the carbon nanotube array provided by the embodiment is not limited to the above preparation method. It can also be a graphite electrode constant current arc discharge deposition method, a laser evaporation deposition method, or the like.

Step 2: Pulling a carbon nanotube film from the carbon nanotube array by using a stretching tool. Specifically, the method comprises the steps of: (a) selecting a plurality of carbon nanotube segments of a certain width from the array of carbon nanotubes; (b) stretching at a certain speed along a growth direction substantially perpendicular to the growth of the carbon nanotube array. A piece of carbon nanotubes is formed to form a continuous film of carbon nanotubes.

In step (a), the present embodiment preferably employs a tape having a width to contact the array of carbon nanotubes to select a plurality of carbon nanotube segments of a certain width. When the width of the carbon nanotube film to be obtained is narrow, a tool having a narrow end face, such as a tweezers, may be used to select the plurality of carbon nanotube segments. During the stretching process of the step (b), the plurality of carbon nanotube segments are gradually separated from the substrate in the stretching direction by the tensile force, and the selected plurality of carbon nanotube segments are affected by the van der Waals force. They are continuously pulled out end to end with other carbon nanotube segments to form a carbon nanotube film. Referring to FIG. 3, the carbon nanotube film comprises a plurality of carbon nanotube segments, each of the carbon nanotube segments having substantially equal lengths and each of the carbon nanotube segments being composed of a plurality of mutually parallel nanocarbons. The tube bundle is formed, and the carbon nanotube segments are connected to each other by Van der Waals force. The arrangement of the carbon nanotubes in the carbon nanotube film is substantially parallel to the stretching direction of the carbon nanotube film. The direct-stretched aligned carbon nanotube film has better uniformity than the disordered carbon nanotube film, that is, has a more uniform thickness and has uniform electrical conductivity. At the same time, the direct stretching method for obtaining the carbon nanotube film is simple and rapid, and is suitable for industrial application.

In this embodiment, the width of the carbon nanotube film is related to the size of the substrate on which the carbon nanotube array is grown. The length of the carbon nanotube film is not limited and can be obtained according to actual needs. In this embodiment, a 4-inch substrate is used to grow a super-sequential carbon nanotube array. The width of the carbon nanotube film can be from 1 micrometer to 10 centimeters, and the thickness of the carbon nanotube film is from 0.5 nanometer to 10 micrometers. . The carbon nanotubes include single-walled carbon nanotubes, double-walled carbon nanotubes or multi-walled carbon nanotubes. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5 nm to 50 nm. Nano.

It can be understood that since the carbon nanotube in the super-sequential carbon nanotube array of the embodiment is very pure, and the specific surface area of the carbon nanotube itself is very large, the carbon nanotube film itself has strong viscosity. . Therefore, the carbon nanotube film can be directly adhered to the first substrate 120 or the second substrate 140 and electrically connected to the first conductive layer 122 or the second conductive layer 142 to form the first electrode 124 and the second electrode, respectively. Electrode 144. Specifically, the two first electrodes 124 are respectively adhered to both ends of the first conductive layer 122 in the first direction and are electrically connected to the first conductive layer 122, and the two second electrodes 144 are respectively adhered to the second conductive layer. The ends 142 are electrically connected to the second conductive layer 142 at both ends in the second direction. It can be understood that the first electrode 124 and the second electrode 144 can be directly adhered to the first conductive layer 122 and the second conductive layer 142, respectively.

Further, the above carbon nanotube film can be treated with an organic solvent. Specifically, the organic solvent may be dropped on the surface of the carbon nanotube film by a test tube to infiltrate the entire carbon nanotube film. The organic solvent is a volatile organic solvent such as ethanol, methanol, acetone, dichloroethane or chloroform, which is used in this embodiment. Ethanol. After the carbon nanotube film is infiltrated by an organic solvent, the carbon nanotube film can be firmly attached to the surface of the substrate under the action of the surface tension of the volatile organic solvent, and the surface volume ratio is reduced and the viscosity is lowered. Has good mechanical strength and toughness.

In addition, when the first electrode 124 and/or the second electrode 144 are a multi-layered carbon nanotube film, the plurality of carbon nanotube films prepared according to the above method may be adhered to the first substrate 120 in an overlapping manner in any direction. Or on the second substrate 140. Preferably, the plurality of carbon nanotube films are adhered to the first substrate 120 in different directions and electrically connected to the first conductive layer 122 to form the first electrode 124, and adhere to the second substrate in different directions. The second conductive layer 142 is electrically connected to the second conductive layer 142 to form the second electrode 144.

It can be understood that when the carbon nanotube film is used as the first electrode 124 and the second electrode 144 of the touch screen 10 in this embodiment, the contact resistance between the electrode and the conductive layer is reduced, thereby further improving the accuracy of the touch screen. A carbon nanotube film or a multilayer carbon nanotube film may be disposed on the surface of the first substrate 120 and the second substrate 140 as a first conductive layer 122 and a method similar to the method of forming the first electrode 124 and the second electrode 144. Two conductive layers 142. The size and shape of the touch screen are not limited by the size of the carbon nanotube film. When the width of the carbon nanotube film is smaller than the width of the touch screen, in order to cover the entire surface of the substrate, a plurality of carbon nanotube films having a certain width can be seamlessly laid on the surface of the substrate to form a complete conductive layer. . The carbon nanotube film in the first conductive layer 122 is disposed along the first direction, and the carbon nanotube in the carbon nanotube film is different from the structure of the carbon nanotube film or the carbon nanotube film used in the electrode. The tubes are arranged in a preferred orientation along the first direction; the carbon nanotube film in the second conductive layer 142 is disposed along the second direction The carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation along the second direction.

Further, alternatively, in order to reduce electromagnetic interference generated by the display device and avoid errors in signals emitted from the touch screen 10, a shield layer may be disposed on the lower surface of the second substrate 140. The shielding layer may be formed of a conductive material such as indium tin oxide (ITO), antimony tin oxide (ATO) or a carbon nanotube film. In this embodiment, the shielding layer comprises a carbon nanotube film, and the arrangement of the carbon nanotubes in the carbon nanotube film is not limited, and may be aligned or in other arrangements. In this embodiment, the carbon nanotubes in the shielding layer are aligned. The carbon nanotube film acts as an electrical grounding point and acts as a shield, thereby enabling the touch screen 10 to operate in an interference-free environment.

Referring to FIG. 4 , the embodiment of the present invention further provides a display device 100 using the touch screen 10 , which includes the touch screen 10 and a display device 20 . The display device 20 is disposed adjacent to and adjacent to the second electrode plate 14 of the touch screen 10 described above. The touch screen 10 can be disposed at a predetermined distance from the display device 20, or can be integrated on the display device 20. When the touch screen 10 is integrated with the display device 20, the touch screen 10 can be attached to the display device 20 by an adhesive.

The display device 20 of the present technical solution may be a display device such as a liquid crystal display, a field emission display, a plasma display, an electroluminescence display, a vacuum fluorescent display, and a cathode ray tube.

Further, when the display device 20 is disposed at a distance from the touch screen 10, the shielding layer 22 of the touch screen 10 can be away from the second substrate 140. A passivation layer 24 is disposed on the surface, and the passivation layer 24 may be formed of a material such as tantalum nitride or hafnium oxide. The passivation layer 24 is spaced apart from the front side of the display device 20 by a gap 26. The passivation layer 24 is used as a dielectric layer and protects the display device 20 from damage due to excessive force on the touch object 60.

In addition, the display device 100 further includes a touch screen controller 30, a central processing unit 40, and a display device controller 50. The touch screen controller 30, the central processing unit 40, and the display device controller 50 are connected to each other through a circuit. The touch screen controller 30 is electrically connected to the touch screen 20. The display device controller 50 is connected to the display device 20. . The touch screen controller 30 positions the selection information input by an icon or menu position touched by a touch object 60 such as a finger, and transmits the information to the central processing unit 40. The central processor 40 controls the display of the display element 20 by the display controller 50.

In use, a voltage of 5 V is applied between the first electrode plates 12 and the second electrode plates 14, respectively. The user visually confirms the display of the display element 20 disposed under the touch screen 10, and presses the touch panel 60 such as a finger or a pen to press the touch panel 10 to the first electrode plate 12. The first substrate 120 in the first electrode plate 12 is bent such that the first conductive layer 122 of the pressing portion 70 is in contact with the second conductive layer 142 of the second electrode plate 14 to form a conduction. The touch screen controller 30 converts the voltage change in the first direction of the first conductive layer 122 and the voltage change in the second direction of the second conductive layer 142, respectively, and performs an accurate calculation to convert it into contact coordinates. The touch screen controller 30 communicates the digitized contact coordinates to the central processor 40. The central processing unit 40 issues corresponding commands according to the contact coordinates, initiates various function switching of the electronic device, and controls the display of the display element 20 by the display controller 50.

The touch screen and the display device using the carbon nanotube layer as an electrode provided by the embodiments of the present technical solution have the following advantages: First, the excellent mechanical properties of the carbon nanotubes make the carbon nanotube film have good toughness and mechanical properties. Intensity, therefore, the use of a carbon nanotube film instead of the previous silver layer as an electrode can correspondingly improve the durability of the touch screen, thereby improving the durability of the display device; and second, the direct stretching method is used to prepare the nano carbon. The tube film has simple process operation and low cost, and can directly adhere to the substrate or the conductive layer by using the directly stretched carbon nanotube film, so that the large-scale production of the touch screen using the carbon nanotube film structure as the electrode is facilitated. And the display device; thirdly, since the carbon nanotube has excellent electrical conductivity, the carbon nanotube film formed by the carbon nanotube has a uniform electrical conductivity and can effectively reduce the electrode and the transparent conductive layer. Contact resistance between them to improve the resolution and accuracy of the touch screen and display device; Fourth, when both the electrode and the conductive layer are made of a carbon nanotube film It may further reduce the contact resistance between the electrodes and the conductive layer, so that the accuracy of the touch screen further improved linearity.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧ touch screen

12‧‧‧First electrode plate

14‧‧‧Second electrode plate

16‧‧‧ point spacers

18‧‧‧Insulation

100‧‧‧ display device

120‧‧‧First substrate

122‧‧‧First conductive layer

124‧‧‧First electrode

126‧‧‧Transparent protective film

140‧‧‧Second substrate

142‧‧‧Second conductive layer

144‧‧‧second electrode

20‧‧‧ display elements

22‧‧‧Shield

24‧‧‧ Passivation layer

26‧‧‧ gap

30‧‧‧ touch screen controller

40‧‧‧Central processor

50‧‧‧Display Controller

60‧‧‧ touching objects

70‧‧‧ Press

FIG. 1 is a schematic perspective structural view of a touch screen according to an embodiment of the present technical solution.

FIG. 2 is a schematic side view showing the structure of a touch screen according to an embodiment of the present technical solution.

3 is a scanning electric current of a carbon nanotube film in a touch screen according to an embodiment of the present technical solution. Mirror photo.

FIG. 4 is a schematic structural diagram of a display device according to an embodiment of the present technical solution.

10‧‧‧ touch screen

12‧‧‧First electrode plate

14‧‧‧Second electrode plate

16‧‧‧ point spacers

18‧‧‧Insulation

120‧‧‧First substrate

122‧‧‧First conductive layer

124‧‧‧First electrode

140‧‧‧Second substrate

142‧‧‧Second conductive layer

144‧‧‧second electrode

Claims (26)

A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate, a first conductive layer is disposed on a lower surface of the first substrate, and two first electrodes are disposed in the first direction a second electrode plate, the second electrode plate is spaced apart from the first electrode plate, the second electrode plate includes a second substrate, and a second conductive layer is disposed on the upper surface of the second substrate And the two second electrodes are disposed at two ends of the second conductive layer along the second direction; the improvement is that at least one of the first electrode and the second electrode comprises a carbon nanotube layer, the carbon nanotube The layer consists only of carbon nanotubes. The touch screen of claim 1, wherein the carbon nanotube layer comprises a layer of carbon nanotube film or a stacked multi-layered carbon nanotube film. The touch screen of claim 2, wherein the carbon nanotubes in the carbon nanotube film are disordered or isotropic. The touch screen of claim 3, wherein the carbon nanotubes in the carbon nanotube film are parallel to the surface of the carbon nanotube film. The touch screen of claim 3, wherein the carbon nanotubes in the carbon nanotube film are intertwined with each other. The touch screen of claim 2, wherein the carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation along a fixed direction or in a preferred orientation in different directions. The touch screen of claim 6, wherein: the carbon nanotubes arranged in a fixed direction have equal lengths and pass the van der Waals force Connected end to end to form a continuous bundle of carbon nanotubes. The touch screen of claim 7, wherein: the carbon nanotube bundles in the adjacent two layers of carbon nanotube film in the plurality of overlapping carbon nanotube films form an angle α, and 0° α 90°. The touch screen of claim 2, wherein the carbon nanotube film has a thickness of 0.5 nm to 100 μm. The touch screen of claim 2, wherein the carbon nanotube film has a width of 1 micrometer to 10 centimeters. The touch screen of claim 1, wherein the carbon nanotubes in the carbon nanotube layer are single-walled carbon nanotubes, double-walled carbon nanotubes or multi-walled carbon nanotubes. The touch screen of claim 11, wherein: the single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, and the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm. The multi-walled carbon nanotube has a diameter of 1.5 nm to 50 nm. The touch screen of claim 1, wherein the first direction is perpendicular to the second direction. The touch screen of claim 1, wherein the touch screen further comprises an insulating layer disposed on a periphery of the second electrode plate surface, the first electrode plate being disposed on the insulating layer and spaced apart from the second electrode plate. The touch screen of claim 14, wherein the touch screen further comprises a plurality of dot spacers disposed between the first electrode plate and the second electrode plate, the plurality of dot spacers being disposed at the second conductive On the floor. The touch screen of claim 1, wherein the touch screen further comprises a shielding layer disposed on a lower surface of the second substrate of the touch screen, the shielding layer material is indium tin oxide, antimony tin oxide Or nano Carbon tube film. The touch screen of claim 1, wherein the first base material is a polyester film. The touch screen of claim 1, wherein the second base material is glass, quartz, diamond or a flexible transparent material. The touch screen of claim 1, wherein: at least one of the first conductive layer and the second conductive layer comprises a carbon nanotube layer. The touch screen of claim 1, wherein: a transparent protective film is disposed on the surface of the first electrode plate, and the transparent protective film material is tantalum nitride, hafnium oxide, benzophenone (BCB), poly Ester film and acrylic resin or polyethylene terephthalate. A display device includes: a touch screen, the touch panel includes a first electrode plate and a second electrode plate, the first electrode plate includes a first substrate and a first conductive layer disposed on a lower surface of the first substrate The second electrode plate is spaced apart from the first electrode plate, the second electrode plate includes a second substrate and a second conductive layer disposed on the upper surface of the second substrate; and a display device, the display device is directly opposite A second electrode plate disposed adjacent to the touch screen; the improvement is that at least one of the first electrode and the second electrode comprises a carbon nanotube layer, the carbon nanotube layer being composed only of a carbon nanotube. The display device of claim 21, wherein the display device further comprises a touch screen controller, a central processing unit and a display device controller, wherein the touch screen controller, the central processing unit and the display The device controllers are connected to each other through a circuit, and the touch screen controller is electrically connected to the touch screen, and the display device controller is connected to the display device. The display device of claim 21, wherein the display device is one of a liquid crystal display, a field emission display, a plasma display, an electroluminescence display, a vacuum fluorescent display, and a cathode ray tube display. The display device of claim 21, wherein the touch screen is spaced apart from the display device or the touch screen is integrated on the display device. The display device of claim 21, wherein the touch screen further comprises a shielding layer disposed on a lower surface of the second substrate of the touch screen, the shielding layer material is indium tin oxide, antimony tin oxide Or carbon nanotube film. The display device of claim 25, wherein the touch screen further comprises a passivation layer disposed on a surface of the shielding layer away from the second substrate of the touch screen, the passivation layer being oxidized by tantalum nitride矽 formation.